Add a `COMMAND_EXPAND_LISTS` option to the `add_test` command to cause
`;`-separated lists produced by generator expressions to be expanded
into multiple arguments.  The `add_custom_command` command already
has such an option.

Fixes: #17284

The `make_directory` command can make multiple directories in a single
invocation.  Make `remove_directory` mirror that behavior.

Currently, the compiler does not synthesize the correct entry point for
the application and passing the subsystem flag does not work the same
way with the Swift linker language.  Add a check to prevent the
application of `WIN32_EXECUTABLE` to Swift executables until they can be
properly supported.  This will prevent the need for a future policy
change.

Closes: #19325

This allows for expressions such as:

 $<COMPILE_LANG_AND_ID, CXX, GNU, Clang>

This allows for expressions like:
 $<$<CXX_COMPILER_ID:Clang,GNU>:-DMY_PRIVATE_DEFINE>

Previously genex support for unbounded number of parameters required
at least 1 parameter. We now support zero or more parameters, and two
or more parameters.

Fixes: #19321

Fixes: #19301

Avoid the use of `CMAKE_{EXE,SHARED}_LINKER_FLAGS` when linking with the
Swift language.  This required hoisting the executable flags of
`CMAKE_CREATE_WIN32_EXE`, `CMAKE_CREATE_CONSOLE_EXE`, and
`CMAKE_EXE_EXPORTS_*_FLAG` earlier to avoid a second clause which checks
the language.  This allows for mixed-language Swift projects to properly
link on Windows.

Fixes #19298

Rather than just state the value for VISIBILITY_PRESET was invalid,
we additionally list the accepted values.

Avoid listing the same input more than once in custom commands generated
in `.vcxproj` and `.csproj` files.  In the case of a `.vcxproj` file
additionally avoid listing the source to which the command is attached
since it is already implicitly a dependency.

This is a nice cleanup and also works around a VS 2019 16.1 regression
in MSBuild dependency checking.  Starting with that version, MSBuild now
re-builds custom commands when the list of dependencies has changed.
However, its check is confused by duplicate dependencies.
De-duplicating them avoids this problem.

Co-Author: Brad King <brad.king@kitware.com>
Fixes: #19303